Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337670319
Author: STARR
Publisher: Cengage
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Chapter 44, Problem 7SQ
Summary Introduction
Concept introduction: Population genetics describes the natural selection by defining the species adaptations to their environment. Natural selection is a process in which the organisms adapt to the environment by means of reproduction that selectively have changes in its genotypes. This influences the number of offspring and its life histories.
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Which is an example of directional selection after several generations on an island population from an original population that had an equal number of individuals with thin, moderate, and thick sized legs?
A. Anolis lizards that have evolved thinner legs
b. Anolis lizards that have evolved thin and thick legs
c. Anolis lizards that have evolved moderate sized legs
d. All of the above
E. none of the above
Which of the following best states a condition which promotes natural selection of a species?
A)One baby albino alligator, from a nest of 20 eggs, hatches in the Florida Everglades.
B)The population of moths in a forest increased from 100 to 150 members.
C)An ocean ecosystem consists of more algae than fish species.
D)A female cat has a litter of 5 kittens instead of 6.
Within a particular population, darkly colored rats are more likely to survive than more lightly colored individuals. This situation is likely to result in
a. directional selection.
b. stabilizing selection.
c. disruptive selection.
d. balancing selection.
Chapter 44 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 44 - Iguana Decline In 1987, Martin Wikelski began a...Ch. 44 - Iguana Decline In 1987, Martin Wikelski began a...Ch. 44 - Iguana Decline In 1987, Martin Wikelski began a...Ch. 44 - Most commonly, individuals of a population show a...Ch. 44 - The rate at which population size grows or...Ch. 44 - Suppose 200 fish are marked and released in a...Ch. 44 - Prob. 4SQCh. 44 - For a given species, the maximum rate of increase...Ch. 44 - ______ is a density-independent factor that...Ch. 44 - Prob. 7SQ
Ch. 44 - Prob. 8SQCh. 44 - The human population is now about 7 billion. It...Ch. 44 - Prob. 10SQCh. 44 - Prob. 11SQCh. 44 - Prob. 12SQCh. 44 - The demographic transition model predicts a...Ch. 44 - Prob. 14SQCh. 44 - Match each term with its most suitable...Ch. 44 - Think back to Section 44.6. When researchers moved...Ch. 44 - Mountain gorillas are a highly endangered primate...Ch. 44 - Bluebirds are songbirds that, like wood ducks,...Ch. 44 - The age structure diagrams for two hypothetical...
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- The continued presence of the allele that causes sickle cell anemia in areas where falciparum malaria is prevalent demonstrates which of the following phenomena? (a) inbreeding depression (b) frequency-dependent selection (c) heterozygote advantage (d) genetic drift (e) a genetic bottleneckarrow_forwardBirds with average-sized wings survive storms better than those with longer wings or shorter wings. This illustrates _____. a directional selection b disruptive selection c the bottleneck effect d stabilizing selectionarrow_forwardWhat type of selection is representative of what would happen if the earth were to continually cool, and some bears, such as those with thin or no hair, moved south and other bears with very thick fur stayed up the north. In this type of selection event, both types of bears would be selected for. (a)disruptive selection (b)directional selection (c)stabilizing selection (d)sexual selectionarrow_forward
- The protruding tusk on a narwhal is an enlarged tooth with sensory capabilities. Narwhals are related to other whales. The extreme phenotype of the tusk demonstrates which type of selection? A)Convergent B)Stabilizing C)Directionalarrow_forwardSome females seem to prefer the green colouration and some females seem to prefer the blue colouration. What type of selection is this an example of? a. stabilizing b. balancing c. directional d. diversifyingarrow_forwardA population occupies heterogeneous environments in which the fitness of some genotypes is higher in one environment and the fitness of other individuals is higher in another environment. This situation is likely to result in a. directional selection. b. stabilizing selection. c. disruptive selection. d. balancing selection.arrow_forward
- Assume you are studying a population of hummingbirds. You discover that the smallest hummingbirds can't keep their eggs warm and those eggs tend to fail. You also discover the largest hummingbirds tend to accidentally crush their eggs, so those eggs fail. The medium-size hummingbirds therefore have the highest fitness. What type of selection would this result in? a. Directional selection b. Sexual selection c. Disruptive selection d. Stabilizing selectionarrow_forwardIna population of birds, the average beak size is selected against and the largeand small sized beaks are selected for. This is an example of:a.directional selection.b.disruptive selection.c.stabilizing selection.d.natural selection.e.balanced polymorphism.arrow_forwardNatural selection is the only process that results ina. genetic variation.b. adaptation to the environment.c. phenotypic change.d. competition among individuals in a population.arrow_forward
- When it comes to adaptation, survival of a species' trait through artificial selection depends on a) which trait is the fittest for the environment b) which trait humans desire to reproduce c) which trait is the oldest for the species d) which trait has more abundance in the populationarrow_forwardOne way for disruptive selection to occur is ifa. the population contains diversity.b. the environment contains diversity.c. pollution is present.d. natural selection occurs.e. All of these are correct.arrow_forwardWhich of the following are not agents of natural selection? Select one: A. Neutral interaction with another species B. Competition among individuals for food and water C. Competition among members of a population for prime nesting sites D. Predation by another speciesarrow_forward
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